High-speed attachment for milling-machines.



` G. G. PORTER & F. E. CABLE. HIGH SPEED ATTACHMENT FOR MILLINGMACHINES.

APPLIOATIUN FILED MAY 22, 190B.

1,012,430. Patented Dec. 19, 1911.

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UNITED STATES PATENT OFFICE.

GEORGE G. PORTER AND FRANK E. CABLE, 0F SYRACUSE, NEW YORK.

HIGH-SPEED ATTACHMENT FOR MILLING-MACHINES.

To all whom it may concern:

Be it known that We, GEORGE Gr. PORTER and FRANK E. CABLE, citizens ofthe United States, residing at Syracuse, in the county of Onondaga andState of New York, have.

invented certain new and useful Improvements in High-Speed Attachmentsfor Milling-Machines, of which the following is a specification.

Our present invention pertains to improvements in milling machines, andhas reference more particularly to a high-speed attachment adapted to beapplied to an ordinary commercial miller.

The invention will loe best understood upon reference to theaccompanying drawings, wherein: i

Figure 1 is a perspective view of the upper portion of a millingmachine, showing our invention applied thereto; Fig. 2 is a longitudinalsectional View of the supporting arm for the tool-holder and the drivingmechanism; and Fig. 3 a front elevation of the attachment and a portionof the bed or table, illustrating the manner in which the tool may bebrought to any desired adjustment by means of a protractor or square.

The object of the invention is to provide a device which may be readilysubstituted for the overhanging arm which is employed as a support forthe out-board bearing for the spindle on which the usual milling cuttersare mounted.

The construction is such that thesupport for the high-speed cutter maybe readily substituted for the support or arm which furnishes theout-board bearing, and adjusted to any desired position with relation tothe bed of the machine.

By substituting larger pulleys for smaller ones upon the driving shaftof the attachment a change of speed may be effected, and heavier cutsmay be made by using a large pulley. This change of speed may beaccomplished by employing the pulleys which are generally furnished withmachines of this character.

Referring to the drawings, 1 denotes the main frame of the millingmachine, and 2 a movable bed or table which may be actuated by hand orotherwise, as is usual in this class of machines. Mounted above thetable, and moving upon vertically-disposed ways 3, is a slide 4, whichis provided with a bearing for the power-driven shaft or spindle 5, onthe outer end of which the Specification of Letters Patent.

Application filed May 22, 1908.

Patented Dec. 19, 1911.

serial No. 434,388.

arbor or chuck that carries the ordinary cutter is mounted. The upperportion of the slide is formed with a split box or bearing which inusual practice carries a rod to which is attached the bracket that formsthe out-board support for the outer end of the arbor upon which themilling cutter is mounted. This is the construction commonly employed incommercial machines, and particularly that known as the 7bitney handmiller `When the machine is to` be used for diesinking, profiling,cutting small key-ways and oil-ducts and all kinds of light verticalmilling, it is desirable to employ a tool driven at a high speed, and tothis end we propose to furnish an attachment which can be substitutedfor the shaft or bar above referred to, and is usually mounted in thesplit bearing 6 and may be brought to any desired adjustment withreference to the table. The attachment comprises a hollow sleeve or arm7, of such diameter as to make a neat lit in the split box G, in whichit may be clamped when it has been brought to the desired position. Thesleeve at its outer end is provided with a hollow head S, formed withdiametrioally opposite openings, in which are mounted bushings orbearings 9, 10. These bearings form the support for a rotatable spindleor tool-carrier l1.which maybe of any preferred form. A bevel-gear 12 issecured to the spindle and meshes with a similar gear 13, secured upon ashaft 14 extending longitudinally through the sleeve 7 and carrying atits opposite end a pulley 15, the pulley being removable, so thatpulleys of variable sizes may be employed according to the requirementsof the special tool employed or the work being done. A cap-plate 1G issecured to the outer face of the head 8, and a rib 17 is formed uponsaid plate and stands in true axial alinement with the spindle and thetool carried thereby.

By lthe employment of a protractor, as shown in dotted lines in Fig. 3,the head S may be brought to any desired position with reference to thetable and there secured by tightening up the bolts of the split box G.The use of a protractor avoids the necessity of placing fine graduationsor marks upon the machine, and enables the operator quickly andaccurately to adjust the head.

The arrangement set Forth permits the vertically-disposed spindle of thetool to be adjusted to any angle required. It will likewise be notedthat the tool-spindle may be so set as to stand at rightangles orperpendicular to the table, which position may be readily attained byusing a square brought against the rib 17, the other member of thesquare resting upon the table. ,The arrangement also enables the tableto be brought up to a higher level than would be possible with avertical attachment driven by the usual spindle.

It will be noted that with the presentI device the cutter' assumes aposition just about on a level with the tool which is mounted on theordinary horizontal spindle. This feature makes the performance of thework very much more convenient. This construction permits the tool to berun at a very high rate of speed, and end mills of small diameter may beemployed. At the same time, the device is very sensitively driven, sothat the power used does not exceed the strength limit of the cutterbeing employed.

Having thus described our invention, what we claim is:

1. In a milling machine, the combination of a `fixed frame; a bed; aslide mounted on the frame above the bed and movable toward and from thesame; a bearing carried by the slide; a supporting member mounted andheld in a fixed adjusted position in the bearing; a tool-holder carriedat the outer end of said supporting member, the toolholder standing in aplane at approximately right angles to the face of the table; and meansfor rotating said tool-holder.

2. In a. milling machine, the comb-ination of a fixed frame; a bed;means for traversing the same; a slide mounted on the frame above thebed and movable toward and from the same; a box or bearing carried bythe slide; a supporting member mounted in said box; means for securingsaid member in its axially-adj usted position; a driving shaft extendingthrough said supporting` member; a pulley carried at the outer end ofthe shaft;

-a tool-holder mounted in the opposite end of the supporting member; andgearing 1nterposed between said tool-holder and the shaft.

3. In a milling machine, the combination of a fixed frame; a bed; aslide mounted on the frame above the bed and movable toward and from thesame; a split bearing carried by the slide; a supporting member mountedin the slide; means for clamping the bearingupon the supportingmemberwhen it has been brought to the desired adjusted position; a shaftmounted in the supporting` member; a pulley secured to one end of saidshaft; a tool-holder mounted in the outer end of the supporting member;and gearing IhOlder; and a rib formed upon the supporting member,whereby by the use of a protractor or like instrument the relation" ofthe tool-holder to the bed may be readily determined.

5'. ln a milling machine, the combination of a fixed frame; a bed; aslide movable upon the frame toward and from the bed; a suppoitingmember carried by the slide, the axis of said member lying in a planeapproximately parallel to the bed; a toolholder standing in a plane atrightangles to the axis of the supporting member; means for securing thesupporting member in its desired axial position; means for rotating thetool-holder; and a rib formed upon the outer face of the supportingmember, said rib lying in a plane approximately at right angles to thelongitudinal Aaxis of the supporting member.

6. In a milling machine, the combination of a fixed frame; a bed; aslide mounted upon the frame and movable toward and from said bed; abearing carried by the slide; a supporting member mounted in tbeslide,the axis of said member lying in a plane substantially parallel withthat of the bed; means for securing the supporting member in its desiredaxial adjustment in said bearing; a shaft carried by said supportingmember; means for rotating the shaft; a toolholder, the axis of whichstands in a plane approximately at right angles to the axis of thesupporting member; gearing interposed between said tool-holder and theshaft; and a rib formed upon the outer face of the supporting member,said rib standing in a plane approximately at right angles to thelongitudinal axis of the supporting member.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

GEORGE G. PORTER. FRANK E. CABLE.

lVitnesses z GILEs B. EvERsoN, D. ALFRED EDDY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

